title: Phosphorus improves arsenic phytoremediation by Anadenanthera peregrina by alleviating induced oxidative stress.
abstract: Due to similarities in their chemical behaviors, studies examining interactions between arsenic (As)--in special arsenate--and phosphorus (P) are important for better understanding arsenate uptake, toxicity, and accumulation in plants. We evaluated the effects of phosphate addition on plant biomass and on arsenate and phosphate uptake by Anadenanthera peregrina, an important Brazilian savanna legume. Plants were grown for 35 days in substrates that received combinations of 0, 10, 50, and 100 mg kg(-1) arsenate and 0, 200, and 400 mg kg(-1) phosphate. The addition of P increased the arsenic-phytoremediation capacity of A. peregrina by increasing As accumulation, while also alleviating As-induced oxidative stress. Arsenate phytotoxicity in A. peregrina is due to lipid peroxidation, but not hydrogen peroxide accumulation. Added P also increased the activity of important reactive oxygen species-scavenging enzymes (catalase and ascorbate peroxidase) that help prevent lipid peroxidation in leaves. Our findings suggest that applying P represents a feasible strategy for more efficient As phytoremediation using A. peregrina.
authors.affiliation: Université du Québec at Montréal, Institut des Sciences de l'environnement, Succ. Centre-Ville, Montréal, Québec, Canada. marcelopgom@yahoo.com.br
authors.forename: M P
authors.initials: MP
authors.lastname: Gomes
authors.forename: M
authors.initials: M
authors.lastname: Carvalho
authors.forename: G S
authors.initials: GS
authors.lastname: Carvalho
authors.forename: T C L L S M
authors.initials: TC
authors.lastname: Marques
authors.forename: Q S
authors.initials: QS
authors.lastname: Garcia
authors.forename: L R G
authors.initials: LR
authors.lastname: Guilherme
authors.forename: A M
authors.initials: AM
authors.lastname: Soares
mesh_terms: D000975:Antioxidants / Q000378:metabolism; D001149:Arsenates / Q000032:analysis / Q000378:metabolism*; D060387:Ascorbate Peroxidases / Q000187:drug effects / Q000378:metabolism; D001673:Biodegradation, Environmental / Q000187:drug effects; D018533:Biomass; D001938:Brazil; D002374:Catalase / Q000187:drug effects / Q000378:metabolism; D007887:Fabaceae / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism; D016166:Free Radical Scavengers / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D015227:Lipid Peroxidation; D018384:Oxidative Stress / Q000187:drug effects; D010710:Phosphates / Q000378:metabolism / Q000494:pharmacology*; D018515:Plant Leaves / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D010940:Plant Proteins / Q000187:drug effects / Q000378:metabolism
chemical_list: D000975:Antioxidants; D001149:Arsenates; D016166:Free Radical Scavengers; D010710:Phosphates; D010940:Plant Proteins; D006861:Hydrogen Peroxide; D060387:Ascorbate Peroxidases; D002374:Catalase; C025657:arsenic acid